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Phosphate radical modified cerium-based denitration catalyst as well as preparation method and application thereof

A technology of denitrification catalyst and phosphate radical, which is applied in the direction of catalyst carrier, chemical instrument and method, physical/chemical process catalyst, etc., can solve the problem of poor hydrothermal stability of the catalyst, and achieve good hydrothermal stability, high conversion rate, and operation Simple and convenient effect

Pending Publication Date: 2022-07-08
SICHUAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the problem of poor hydrothermal stability of existing catalysts, the first object of the present invention is to provide a phosphate-modified cerium-based denitration catalyst

Method used

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  • Phosphate radical modified cerium-based denitration catalyst as well as preparation method and application thereof
  • Phosphate radical modified cerium-based denitration catalyst as well as preparation method and application thereof
  • Phosphate radical modified cerium-based denitration catalyst as well as preparation method and application thereof

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preparation example Construction

[0042] The embodiment of the second aspect of the present invention provides a method for preparing the phosphate-modified cerium-based denitration catalyst in the embodiment of the first aspect, and the preparation method comprises the following steps:

[0043] Step 1. The cerium salt is directly calcined and cooled to obtain the carrier CeO 2 ;

[0044] Step 2, the carrier CeO obtained in step 1 2 Immerse in a phosphate-containing solution and stir to obtain a catalyst precursor;

[0045] Step 3, drying the catalyst precursor obtained in step 2;

[0046] In step 4, the dried catalyst precursor is calcined, and the calcination is completed and cooled to obtain a phosphate modified cerium-based denitration catalyst.

[0047] In this embodiment, the carrier CeO 2 It is obtained directly from cerium salt after calcination and cooling, and then the acid radical is supported on CeO by impregnation method. 2 , in the later stage, on CeO loaded with phosphate radicals 2 The pr...

Embodiment 1

[0059] The preparation of ceria, the preparation method is as follows:

[0060] Take 11g of cerium nitrate hexahydrate and place it in a muffle furnace, and calcine in the atmosphere of air to obtain CeO 2 The calcination conditions of the catalyst are: the calcination temperature is 500°C, and the calcination time is 2h.

[0061] CeO is obtained in this example 2 The catalyst needs to undergo tableting, crushing and sieving in sequence, and the particle size is 40-60 mesh CeO 2 The catalyst was used for catalyst performance testing.

Embodiment 2

[0063] The preparation of phosphate modified cerium-based denitration catalyst comprises the following steps:

[0064] Step 1. Prepare carrier CeO according to the preparation method of ceria in Example 12 .

[0065] Step 2, take 3g of the carrier CeO prepared in step 1 2 Immerse in 50 ml of ammonium dihydrogen phosphate solution with a molar concentration of 0.070 mol / L and stir for 1 h to obtain a catalyst precursor.

[0066] Step 3: Pour the catalyst precursor obtained in step 2 into a round-bottomed flask, and use a vacuum rotary evaporator to remove the evaporation of water in the catalyst precursor; wherein, the condition of the rotary evaporator to evaporate water is 50°C.

[0067] Step 4. Place the catalyst precursor processed in step 3 in a muffle furnace, and calcinate in an air atmosphere. The conditions during calcination are: calcination temperature is 500 ° C, calcination time is 2 hours, and the calcination is completed and cooled to obtain Phosphate modified ...

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Abstract

The invention discloses a phosphate radical modified cerium-based denitration catalyst as well as a preparation method and application thereof. The catalyst comprises a carrier, the carrier is CeO2, and the carrier CeO2 is obtained by directly calcining cerium salt; the catalyst further comprises phosphate radicals attached to the carrier CeO2. According to the invention, CeO2 obtained by calcination has the characteristic of small oxygen vacancy, so that the crystal structure of the carrier CeO2 is more stable, Ce < 4 + > in the carrier CeO2 after hydrothermal treatment is not easy to change into Ce < 3 + >, and the carrier CeO2 still keeps higher oxidability. Besides, the combination between the carrier CeO2 with small oxygen defects and the acid radical ions is more stable, and the acid radical ions can be prevented from being damaged during hydro-thermal treatment, so that the phosphate radical modified cerium-based denitration catalyst with good thermal stability and higher NH3-SCR performance is formed.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a phosphate modified cerium-based denitration catalyst and a preparation method and application thereof. Background technique [0002] Nitrogen oxides (NOx) are one of the major air pollutants facing the world today. Nitrogen oxides are mainly NO 2 , NO, N 2 O, N 2 O 5 , N 2 O 3 , N 2 O 4 etc., with NO 2 and NO are the most harmful. Nitrogen oxides in the atmosphere are one of the main causes of acid rain. Acid rain will damage soil, plants, rivers, and corrode buildings and equipment. At the same time, NOx will also destroy the atmospheric ozone layer and aggravate the greenhouse effect. In addition, NOx and air The photochemical smog produced by a series of chemical reactions of the hydrocarbons in the air is harmful to human health. [0003] With the further development of my country's industrialization, people's living standards have gradually improved, and the n...

Claims

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Application Information

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IPC IPC(8): B01J27/18B01J35/10B01J23/10B01J32/00B01D53/86B01D53/56
CPCB01J27/1804B01J23/10B01D53/8628B01J35/647Y02A50/20
Inventor 宋磊鲁思汝岳海荣马奎赵永清朱德林陈伟唐思扬钟山梁斌
Owner SICHUAN UNIV
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